This is not a bug, but not sure how to add a suggestion. I love the
helpful Sorry! messages and I think there is some room for an
improvement to one. It would have saved me about 20 mins headache
last night anyway.

Bitwise operators in perl6 are not the same as in c, perl5 or other
languages and this can catch people out. I discovered a helpful
message with >> but there is none for & instead it makes a
junction for you. It took me ages to figure this out.